Direct from Carbotech FAQ section:
If you have had another manufacturers brake pads on those same rotors; then you will ABSOLUTELY have to replace or resurface (turn) those rotors before installing the Carbotech brake pads.

If the rotors and drums are in relatively good condition, meaning they are smooth, flat, with no visible cracks, deep scoring, distorted, and with no other visible damage; and you have ONLY had Carbotech brake pads on them, then they do not have to be resurfaced or replaced.

Carbotech AX6
The AX6 takes the place of the Panther Plus compound that was so successful. AX6 was specifically engineered for Autocross applications. A high torque brake compound delivering reliable and consistent performance over a very wide operating temperature range (150°F to 1250°F +). Advanced compound matrix provides an excellent initial bite, high coefficient of friction, and very progressive brake modulation and release characteristics. AX6 offers high fade resistance, rotor friendliness at all temperatures, excellent cold stopping power, and non corrosive dust. As a result, AX6 is an excellent choice for Autocross & novice track day drivers and beginner high performance driver education (HPDE) drivers on street driven cars using street tires eliminating the need to change brake pads at the track. AX6 has gained tremendous popularity with SCCA Prosolo/Solo2 competitors for its fantastic bite, release & modulation. Many drivers use the AX6 for street driving as well, even though Carbotech doesn't recommend street driving with AX6 due to possible elevated levels of dust and noise. AX6 is NOT a race compound, and should not be used as such. AX6 shouldn't be used by any intermediate or advanced track day drivers, and should not be used with R compound tires (racing tires). Cars in excess of 300hp and/or 3,000lbs should not use AX6 for any track use.

Available Options:
Option:	nonePre-bedded pads (+$20.00)
This product was added to our catalog on Friday 06 August, 2010.